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The Docker images provide several methods for configuring Kibana. The
conventional approach is to provide a kibana.yml file as described in
Configuring Kibana, but it’s also possible to use
environment variables to define settings.

Under Docker, Kibana can be configured via environment variables. When
the container starts, a helper process checks the environment for variables that
can be mapped to Kibana command-line arguments.

For compatibility with container orchestration systems, these
environment variables are written in all capitals, with underscores as
word separators. The helper translates these names to valid
Kibana setting names.